muirs umirs miurs imurs uimrs iumrs muris umris mruis rmuis urmis rumis mirus imrus mrius rmius irmus rimus uirms iurms urims ruims irums riums muisr umisr miusr imusr uimsr iumsr musir umsir msuir smuir usmir sumir misur imsur msiur smiur ismur simur uismr iusmr usimr suimr isumr siumr mursi umrsi mrusi rmusi urmsi rumsi musri umsri msuri smuri usmri sumri mrsui rmsui msrui smrui rsmui srmui ursmi rusmi usrmi surmi rsumi srumi mirsu imrsu mrisu rmisu irmsu rimsu misru imsru msiru smiru ismru simru mrsiu rmsiu msriu smriu rsmiu srmiu irsmu rismu isrmu sirmu rsimu srimu uirsm iursm urism ruism irusm riusm uisrm iusrm usirm suirm isurm siurm ursim rusim usrim surim rsuim sruim irsum risum isrum sirum rsium srium
Note: these 'words' (valid or invalid) are all the permutations of the word muirs. These words are obtained by scrambling the letters in muirs.